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Selective catalytic reduction of NO with CO on Pt/W–Ce–Zr catalysts

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Abstract

Various Pt catalysts (Pt/ZrO2, Pt/CeO2, Pt/CeZrO, Pt/WO3/ZrO2 and Pt/WO3/CeZrO) were prepared and characterized, and their catalytic reduction reactions of NO by CO, with or without the presence of excess oxygen, were investigated. The results of temperature-programmed experiments showed that CO could be easily oxidized over Pt/CeO2 and Pt/CeZrO while the introduction of WO3 into the catalyst (Pt/WO3/CeZrO) inhibited the reduction of catalyst surface; NO could not dissociate over those catalysts in oxidized state but after CO reduction at a low temperature, NO dissociation took place only over Pt/CeO2 and Pt/CeZrO catalysts. For NO + CO reaction, those easily reduced catalysts Pt/CeO2 and Pt/CeZrO exhibited better catalytic performances, and NO could be rapidly converted below 350 °C. For the reaction with the presence of excess O2, the NO conversions were significantly inhibited, but better NO conversions were obtained over the tungstate-contained catalysts when compared with Pt/CeO2 and Pt/CeZrO. The higher activities of Pt/W–Ce–Zr catalysts were attributed to their high acidities.

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Acknowledgement

The financial support by the Brain Korea 21 (BK21) program from Korea Ministry of Education is acknowledged.

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Authors and Affiliations

  1. JiangSu Entry-Exit Inspection and Quarantine Bureau, Nan**g, 210001, People’s Republic of China

    Hai-ou Zhu

  2. Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 305-701, Korea

    Jeong-Rang Kim & Son-Ki Ihm

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  1. Hai-ou Zhu
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  2. Jeong-Rang Kim
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  3. Son-Ki Ihm
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Correspondence to Hai-ou Zhu.

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Zhu, Ho., Kim, JR. & Ihm, SK. Selective catalytic reduction of NO with CO on Pt/W–Ce–Zr catalysts. React Kinet Catal Lett 97, 207–215 (2009). https://doi.org/10.1007/s11144-009-0049-6

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  • DOI: https://doi.org/10.1007/s11144-009-0049-6

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